Jump to main content
Jump to site search


Mechanistic insights into the lignin dissolution behaviors of a recyclable acid hydrotrope, deep eutectic solvent (DES), and ionic liquid (IL)

Author affiliations

Abstract

Currently, recyclable acid hydrotropes (p-TsOH), deep eutectic solvents (DES, ChCl-Lac), and ionic liquids (IL, [Amim][Cl]) are receiving increasing attention due to their superior delignification performance. However, very few mechanistic studies have shed light on the questions of how these solvents achieve the rapid dissolution of lignin and why they exhibit dramatic differences in the lignin removal. In this study, we first developed a comparative study of their delignification capacities. Under the same pretreatment temperature of 80 °C, three solvents exhibited a remarkable difference in the lignin removal: p-TsOH hydrotrope (86%, 1.5 h) > ChCl-Lac (11%, 15 h) > [Amim][Cl] (0%, 15 h). The extracted lignin samples were characterized via FTIR, TGA, 31P NMR, and 2D HSQC NMR spectroscopy to evaluate their structural properties. Moreover, mechanistic insights into the differences in lignin removal were analyzed via combined quantum chemistry (QC) calculations and molecular dynamics (MD) simulations. The results indicated that both C–H⋯π and strong H-bonding interactions contribute to the highest interaction energy (ΔE = 15.11 kcal mol−1) between p-TsOH hydrotrope and VG, which resulted in the high lignin removal.

Graphical abstract: Mechanistic insights into the lignin dissolution behaviors of a recyclable acid hydrotrope, deep eutectic solvent (DES), and ionic liquid (IL)

Back to tab navigation

Supplementary files

Article information


Submitted
06 Aug 2019
Accepted
20 Jan 2020
First published
21 Jan 2020

Green Chem., 2020, Advance Article
Article type
Paper

Mechanistic insights into the lignin dissolution behaviors of a recyclable acid hydrotrope, deep eutectic solvent (DES), and ionic liquid (IL)

H. Ji and P. Lv, Green Chem., 2020, Advance Article , DOI: 10.1039/C9GC02760B

Social activity

Search articles by author

Spotlight

Advertisements